package com.itheima.config;

import lombok.extern.slf4j.Slf4j;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;

import java.util.List;

/**
 * @email 1572178030@qq.com
 * @author:黄海宾
 * @date: 2023/2/5  18:36
 * 映射配置文件
 */

@Slf4j
@Configuration
public class WebMvcConfig extends WebMvcConfigurationSupport {

    @Override
    protected void addResourceHandlers(ResourceHandlerRegistry registry) {
   /*     log.info("开始进行静态资源映射...");
        registry.addResourceHandler("/backend/**")
                .addResourceLocations("classpath:/backend/");
        registry.addResourceHandler("front/**")
                .addResourceLocations("classpath:/front/");
*/
        log.info("开始进行静态资源映射...");
        //管理端配置配置
        registry.addResourceHandler("/backend/**")
                .addResourceLocations("classpath:/backend/");
        //客户端配置
        registry.addResourceHandler("/front/**")
                .addResourceLocations("classpath:/front/");
    }

    /**
     * 对象映射器:基于jackson将Java对象转为json，或者将json转为Java对象
     * 将JSON解析为Java对象的过程称为 [从JSON反序列化Java对象]
     * 从Java对象生成JSON的过程称为 [序列化Java对象到JSON]
     */



    /**
     * 关于java对象，转化为json
     * 扩展mvc框架的消息转换器
     * @param converters
     */
    @Override
    protected void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
        log.info("扩展消息转换器...");
        //创建消息转换器对象
        MappingJackson2HttpMessageConverter messageConverter = new MappingJackson2HttpMessageConverter();
        //设置对象转换器，底层使用Jackson将Java对象转为json
        messageConverter.setObjectMapper(new JacksonObjectMapper());
        //将上面的消息转换器对象追加到mvc框架的转换器集合中
        converters.add(0,messageConverter);
    }
}
